Display sheet, display device, and electronic apparatus

Abstract

A display device includes: a substrate provided on a side of the display surface; a counter substrate disposed to face the substrate; a display layer provided between the substrate and the counter substrate and filled with a dispersion liquid formed of a dispersion medium in which white particles and black particles charged with polarities opposite to each other are dispersed; and a particle constrained layer provided in the display layer, and suppresses the white particles and the black particles from moving in an in-plane direction of the display layer, while allowing the particles to move in the thickness direction of the display layer. In the display device, a particle constrained layer is provided to be separated from the substrate.

What is claimed is: 
     
       1. A display sheet comprising:
 a first substrate which is provided on a side of a display surface; 
 a second substrate which is disposed to face the first substrate; 
 a display layer which is provided between the first substrate and the second substrate and filled with a dispersion liquid in which at least one kind of particle is dispersed in a dispersion medium, the particles being charged positively or negatively; and 
 a particle constrained layer which is provided in the display layer, 
 wherein the particle constrained layer is provided to be separated from the first substrate; and 
 a separated distance between the particle constrained layer and the first substrate is equal to or more than one time and equal to or less than five times an average particle diameter of the particles. 
 
     
     
       2. The display sheet according to  claim 1 , wherein the particle constrained layer is provided to be separated from the second substrate. 
     
     
       3. The display sheet according to  claim 2 , wherein a separated distance between the particle constrained layer and the second substrate is equal to or more than one time and equal to or less than five times an average particle diameter of the particles. 
     
     
       4. The display sheet according to  claim 1 , further comprising a fixing member which is provided in the display layer and fixes the particle constrained layer to the first substrate. 
     
     
       5. The display sheet according to  claim 4 , wherein the fixing member is in a pillar shape in such a manner as to be extended in a thickness direction of the display layer. 
     
     
       6. The display sheet according to  claim 4 , wherein the number of fixing members per unit area of the display layer is larger in the center portion rather than in a peripheral portion of the display layer. 
     
     
       7. The display sheet according to  claim 1 , wherein the particle constrained layer includes at least one of a porous body, a network structure body, and a fiber aggregate. 
     
     
       8. The display sheet according to  claim 1 , wherein the particle constrained layer suppresses the particles from moving in an in-plane direction of the display layer while allowing the particles to move in a thickness direction of the display layer. 
     
     
       9. The display sheet according to  claim 1 , wherein the dispersion liquid includes first particles, which are charged positively or negatively and second particles which are charged with polarities opposite to the first particles, and
 wherein average particle diameters of the first particles and the second particles are substantially the same. 
 
     
     
       10. A display device comprising the display sheet according to  claim 1 . 
     
     
       11. An electronic apparatus comprising the display device according to  claim 10 . 
     
     
       12. A display sheet comprising:
 a first substrate which is provided on a side of a display surface; 
 a second substrate which is disposed to face the first substrate; 
 a display layer which is provided between the first substrate and the second substrate and filled with a dispersion liquid in which at least one kind of particle is dispersed in a dispersion medium, the particles being charged positively or negatively; 
 a particle constrained layer which is provided in the display layer; 
 wherein the particle constrained layer is provided to be separated from the first substrate; and 
 a fixing member which is provided in the display layer and fixes the particle constrained layer to the first substrate, the fixing member being in a pillar shape extending in a thickness direction of the display layer, 
 wherein a separated distance between the particle constrained layer and the first substrate is equal to or more than one time and equal to or less than five times an average particle diameter or the particles. 
 
     
     
       13. The display sheet according to  claim 12 , wherein the particle constrained layer is provided to be separated from the second substrate. 
     
     
       14. The display sheet according to  claim 13 , wherein a separated distance between the particle constrained layer and the second substrate is equal to or more than one time and equal to or less than five times an average particle diameter of the particles. 
     
     
       15. The display sheet according to  claim 12 , wherein the number of fixing members per unit area of the display layer is larger in the center portion rather than in a peripheral portion of the display layer.